How Many Types of Brake Fluid Are There for Cars?
1 Answers
Automotive brake fluids are divided into three types: alcohol-based, mineral oil-based, and synthetic. Among these, alcohol-based and mineral oil-based fluids have been phased out, and the brake fluids available on the market today are synthetic. Alcohol-based brake fluid is formulated from low-carbon alcohols and castor oil. In cold regions, a mixture of 34% castor oil, 13% glycerol (glycerin), and 53% ethanol can still ensure normal braking performance at around -35 degrees Celsius. Mineral oil-based brake fluid is made from refined light diesel fractions with the addition of thickeners and other additives. This type of brake fluid has better temperature adaptability than alcohol-based fluids, with an operational temperature range of -70 to 150 degrees Celsius. However, since it has a swelling effect on natural rubber, all rubber cups and hoses in the braking system should be replaced with oil-resistant rubber components before using this fluid to avoid corrosion and brake failure. Synthetic brake fluid is artificially synthesized and primarily composed of polyethers, water-soluble polyesters, silicone oils, etc., with the addition of lubricants and additives. It offers excellent performance and can operate at temperatures exceeding 200 degrees Celsius. It has minimal corrosive effects on rubber and metal, making it suitable for high-speed, high-power, heavy-load, and frequently braking vehicles. As a result, it has become the most widely used type of brake fluid today.
